-100-99-98-...-2-1-0+1+2+...+97+98+99

Bilangan negatif:
-100-99-98...-2-1
-1 -2 -3 ...-99-100
=-101 -101-101...-101-101
= 101 ×100 ÷ 2
= -5050
Bilangan positif:
1 + 2 +3 +4.... +50
50+49+48+47... +1
=51+51+51+51.... +51
=51×50 ÷ 2 = 1.275
Jadi: bil. Negatif+bil. Positif
= -5050 + 1.275 = -3.785

-100-99-98-...-2-1-0+1+2+..+97+98+99 =
-5.050 + 1.275
=-3.785